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In-situ photoisomerization of azobenzene to inhibit ion-migration for stable high-efficiency perovskite solar cells

查看全文 作　　者：Xuejiao [1]Zuo;Yiyang [1]He;Hongyu [1]Ji;Yong [1]Li;Xiuying [1]Yang;Binxun [2]Yu;Tao [2]Wang;Zhike [1]Liu;Wenliang [1]Huang;Jing [1]Gou;Ningyi [3]Yuan;Jianning [3]Ding;Shengzhong Frank [1]Liu 高影响力作者 机构地区：[1]Shaanxi Key Laboratory for Advanced Energy Devices,Shaanxi Engineering Lab for Advanced Energy Technology,School of Materials Science and Engineering,Shaanxi Normal University,Xi’an 710119,Shaanxi,China;[2]School of Chemistry and Chemical Engineering,Shaanxi Normal University,Xi’an 710119,Shaanxi,China;[3]School of Materials Science and Engineering,Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering,Jiangsu Province Cultivation Base for State,Key Laboratory of Photovoltaic Science and Technology,Changzhou University,Changzhou 213164,Jiangsu,China高影响力机构 出　　处：《Journal of Energy Chemistry》索引2022年第31卷第10期,共10页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(21603140);the 111 Project(B21005)。 摘　　要：Ion migration is a notorious problem in perovskite solar cells(PSCs)that severely mutilates device performance.Herein,a strategy to inhibit ion migration in situ is developed by using photoisomerization of azobenzene(AZO)to immobilize cations in the lattice.During the nucleation process,the photoisomerized cis-AZO reacts with FA^(+),MA^(+)and Pb2+cations in the perovskite precursor by synergistic cation-πinteraction and Lewis base coordination,leading to heterogeneous nucleation to produce uniform perovskite film.Meanwhile,it accelerates conversion of intermediate yellowδ-phase to desired black aphase of FAPb I3for improved crystallinity with well-passivated grain surface.Consequently,defect density is effectively reduced for the perovskite film to demonstrate suppressed carrier recombination and enhanced carrier extraction.Subsequently,the solar cell efficiency is elevated from 21.29%to 23.58%with negligible J-V hysteresis.Long-term stability is also improved,with the bare device without any encapsulation retaining 84%of its initial efficiency after aging 744 hours in ambient. 关 键 词：PEROVSKITE Solar cell PHOTOVOLTAIC PHOTOISOMERIZATION
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